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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfb3d59220c801faf65e1aa4a52a17fcf9e5de38838649d93e47bdad3be0c5d5' 
  AND token = 'NtMIY9bAaTExdNaE2p2G9v6iefSQmaNQrCBv4nW69A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}